If you are having trouble finding a driver for an ISA myson century mtd392n, try peeling the YES net sticker off the card and see if it is actually a realtek 8019as. If it is, this file should work (it worked for me, anyway)
Just remove any detected network cards from control panel, reboot, go to add new hardware, answer "no" to "let windows search for new hardware"
select "network adaptors" from the list, click "have disk" and browse to wherever you put this downloaded file.
Hope this helps!